First-principles study of monolayer SnS2(1−x)Se2x alloys as anode materials for lithium ion batteries

First-principles study of monolayer SnS2(1−x)Se2x alloys as anode materials for lithium ion batteries
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单层SnS2(1-x)Se2x合金作为锂离子电池负极材料的第一性原理研究

DOI:
10.1016/j.apsusc.2018.06.030
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发表时间:
2018-11
影响因子:
6.7
通讯作者:
Dai Xianqi
Dai Xianqi
中科院分区:
材料科学1区
文献类型:
--
作者:
Wang Tianxing;Yin Lizhi;Zhao Rumeng;Xia Congxin;Zhao Xu;安义鹏;Wei Shuyi;Dai Xianqi

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基于密度泛函理论,研究了x−为0,0.2 5,0.5,0.75,1的单层SnS2(1 = x)Se2 x合金作为锂离子电池负极材料的性能。计算结果表明,SnS_2(1−_x)Se_2x合金的禁带宽度随Se浓度的增加而减小。在锂吸附方面,锂离子注入后,合金由半导体转变为金属,适合作为电极材料。此外,SnS_2(1−_x)Se_2x合金与原始SnS_2系统相比,保持了低势垒能并提高了吸附强度。随着Se浓度的增加,系统的平均开路电压(OCv)值几乎没有变化,但系统容量从293mAh/g降至194mAh/g。 。
Based on density functional theory, the performance of the monolayer SnS2(1−x)Se2xalloys with variation of x = 0, 0.25, 0.5, 0.75, 1 as the anode material for using in Lithium-ion batteries (LIBs) are examined. Numerical results show that the values of the band gap of SnS2(1−x)Se2xalloys decrease with the increase of Se concentration. For Li adsorption, the alloys changed from semiconductor to metal after the insertion of Li and becomes suitable for being used as electrode material. Also, the low barrier energy is kept and the adsorption strength is enhanced in the SnS2(1−x)Se2xalloys compared with that of the pristine SnS2system. With increased concentration of Se, little influence on the average open circuit voltage (OCV) value is observed, though the capacity of the system decreases from 293 to 194 mAh/g.
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